Determination of Sulfuric Acid Vapor or Mist and Sulfur Dioxide Emissions from Kraft Recovery Furnaces
Controlled Condensate (CTM-13 / 8A) is an alternative to EPA Method 8 for determining sulfuric acid emissions. Sulfuric acid vapor or mist and the sulfur dioxide are separated by controlling the condensation based on the difference in dew points: both fractions are measured separately by the barium-thorin titration method.
This method is applicable for the determination of sulfuric acid
vapor or mist (including sulfur trioxide, and in the presence of other particulate
matter) and sulfur dioxide emissions from kraft recovery furnaces. Tests have
shown the minimum detectable limits of the method are 0.50 milligrams/cubic
meter (3.1 x 10-8 lb/ft3) for sulfur trioxide. No upper limits have been established.
Based on theoretical calculations, for 200 mL of 3% hydrogen peroxide solution,
the upper concentration limit for sulfur dioxide in a 1.0 m3 (35.3 ft3) gas sample is about 12,500 mg/m3 (7.7 x 10-4 lb/ft3). The upper limit can be extended by increasing the quantity of peroxide solution in the impingers. Possible interfering agents of this method are fluorides, free ammonia, dimethyl aniline and recovery furnace salt cake.
For more information and documents about CTM-13, please consult the EMC Conditional Test Method Directory.
Apex Instruments offers a Controlled Condensate Sampling System. If interested in CTM-13 sampling, Apex Instruments works with our customers to make sure we are providing the correct products for your project and will provide you with a price quote. For any questions about our sampling system, please contact sales@apexinst.com.